November 03, 2016

A Space-Time Analysis of LTE and Wi-Fi Inter-working

  • Guoqiang Mao
  • Lopez-Perez D.
  • Ming Ding
  • Youjia Chen
  • Zihuai Lin

Cooperative inter-working of the Long Term Evolution (LTE) and the Wireless Fidelity (Wi-Fi) networks have drawn much attention recently, and several strategies have been proposed to enhance their network capacity. In this paper, we propose a new framework to analyse the network performance of several inter-working strategies for the LTE and the Wi-Fi. The proposed framework considers both the LTE and the Wi-Fi systems, both the downlink (DL) and the uplink (UL) transmissions, and the generated interference in both the time and the spatial domains. Based on such framework, we theoretically analyse for the first time the performance of a Wi-Fi network, taking into account the intra-cell time efficiency, and the signal and inter-cell interference with spatial randomness. Moreover, we study the performance of i) a coexisting architecture where Wi-Fi coexists with an ideal CSMA duplex (ID-CSMA) system, which represents an upper bound performance for the LTE Release 14 licensed assisted access (LAA) network, and ii) a brand-new architecture that allows UL on LTE and DL on Wi-Fi, referred to as the Boost architecture. We derive analytical results for both the DL and the UL network performance in terms of the signal quality distribution and the total area system throughput (AST) in these two architectures, and quantify their performance gain compared with the traditional disjoint LTE Wi-Fi architecture. Simulation results validate our analysis results, and show that in a typical outdoor scenario, the coexisting architecture and the Boost architecture can respectively increase the total AST up to 11% and 25%, compared with the traditional disjoint LTE Wi-Fi.

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